TTFB:1.450s
For now I have made opt. for my apache server and still the same. Apache 2.4 , PHP-FPM 5.6, MariaDB 10.01, dedicated server. In my opinion server is good but code not and this generate long time.

For a WordPress site there are several things that could be going on. Two of the most common things that I see come are:

- theme or plugin making calls out to 3rd party services at the PHP level
- theme or plugin making a large amount ( or a few slow ) database queries.

Since you mentioned using PHP 5.6, I'd recommend trying out PHP 7. It is significantly faster than PHP 5.X. Before upgrading the live site, test out PHP 7 in a dev environment, to make sure there are no compatibility issues.

The principle is still the same though. Review the code flow for loading the front of the site for things that could be very expensive. Remote calls to other services, slow database calls, anything that involves a lot of work.

Hi Mattpl - Something else to consider is the location of your server in regards to the location you're testing it from. For example, if your servers are in Europe but you're testing from California that would explain it.

Best to test from where most of your customers are located. And if you want a worldwide presence then there are DNS and CDN optimizations you can do for that.

Using pingdoom tool to test from Stockohlm, time to load website is 1.5s. When I'm using webpagtest to check time for https://szukampracy.pl (loc. Warsaw) I have full load time ~3.7s. Why is this difference? Server location is near Warsaw